lockdown: only return service descriptor if StartService succeeds
lockdown: only return service descriptor if StartService succeeds

patweb/libimobiledevice,upbit/libimobiledevice,kalev/libimobiledevice,patweb/libimobiledevice,libimobiledevice-win32/libimobiledevice,Tatsh/libimobiledevice,upbit/libimobiledevice,libimobiledevice/libimobiledevice,Tatsh/libimobiledevice,kalev/libimobiledevice,libimobiledevice-win32/libimobiledevice,Tatsh/libimobiledevice,Tatsh/libimobiledevice,upbit/libimobiledevice,libimobiledevice-win32/libimobiledevice,patweb/libimobiledevice,libimobiledevice/libimobiledevice,kalev/libimobiledevice,libimobiledevice-win32/libimobiledevice